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题库 / Prep2012-CR-54
In a study conducted in Canada, servers in various restaurants wrote "Thank you" on randomly selected bills before presenting the bills to their customers. Tips on these bills were an average of three percentage points higher than tips on bills without the message. Therefore, if servers in Canada regularly wrote "Thank you" on restaurant their average income from tips would be significantly higher than it otherwise would have been.
Which of the following is an assumption on which the argument relies?
The "Thank you" messages would have the same impact on regular patrons of a restaurant as they would on occasional patrons of the same restaurant.
Regularly seeing "Thank you" written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.
The written "Thank you" reminds restaurant patrons that tips constitute a significant part of the income of many food servers.
The rate at which people tip food servers in Canada does not vary with how expensive a restaurant is.
Virtually all patrons of the Canadian restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have.
错选了A，第一个就用negation把B排除了，不仔细
negationB： regular 写thank you会让老主顾回到之前的tipping模式，就是少给，那写thank you的技巧就不能让人一直都得高工资了！！！
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